Protective mask



FIG. 1 is a perspective view of a protective mask.

FIG. 2 is a front side view of the protective mask of FIG. 1 .

FIG. 3 is a rear side view of the protective mask of FIG. 1 .

FIG. 4 is a left side of the protective mask of FIG. 1 .

FIG. 5 is a right side view of the protective mask of FIG. 1 ; and,

FIG. 6 is a top view of the protective mask of FIG. 1 . 

CLAIM I claim the ornamental design for a protective mask, as shown and described. 